Nitroplumbite
Nitroplumbite is an IMA-recognized mineral species in the nitrate class, with the chemical formula [Pb₄(OH)₄](NO₃)₄.
It crystallizes in the monoclinic crystal system (space group Ia).
Key properties: Mohs hardness 2.5; specific gravity 5.297; White streak; Vitreous to greasy luster; optically biaxial.
IMA symbol Npb, IMA status: approved, named in 2021.
Underground in a secondary efflorescent assemblage on asphaltite and montroseite- and corvusite-bearing sandstone in a Colorado Plateau-type, roll-front, uranium deposit.
It is found associated with Baryte, chalcomenite, volborthite, asphaltite, montroseite, corvusite.
The name refers to its chemical composition, a basic nitrate (nitro) of lead (plumbum).
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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